This increased aid will be sand down a rat hole until they get rid of corrupt leaders like Mugabe
It's not just corrupt leaders, its a corrupt culture. Until African nations undergo a major cultural change, they will NEVER have good government. If you say it cannot be done, just look at how the Japanese changed after Commodore Perry's visit.
That's why Bush made it a targeted aid to help those governments who want to help themselves, like Zambia, e.g.